JP3236509B2 - A moving trolley that transports long workpieces with a rectangular cross section in the horizontal direction - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable carriage for transporting a long workpiece having a rectangular cross section in a horizontal direction, and more particularly to a movable carriage having a mechanism for reversing and lifting a long workpiece having a rectangular cross section. To a transport trolley for transporting the vehicle.

[0002]

2. Description of the Related Art Generally, a long work having a rectangular cross section, for example, a long work having a rectangular cross section such as a bridge or a building steel frame, needs to be inverted, lifted, and conveyed for an assembling process, a welding process, and storage. . For this purpose, the work is reversed by lifting and placing the work on the L-shaped arm with a crane or the like and reversing the L-shaped arm by 90 degrees. When reversing by 180 degrees, the work is lifted by a crane or the like after being reversed by 90 degrees with the L-shaped arm, replaced with the L-shaped arm again, and the L-shaped arm is further reversed by 90 degrees. Further, as a device for reversing and lifting the work, a combination of an L-shaped arm for rotating the work and a traverser having a function of lifting and lowering the work has been proposed.

[0003]

In the conventional art in which a work is lifted and mounted on a L-shaped arm by a crane or the like and the L-shaped arm is turned over, there is a danger of a disaster due to crane sling work. In addition, the operator had to wait for the crane to move during the operation, which resulted in a loss of waiting time. Further, in the case of a combination of an L-shaped arm for rotating a work and a traverser having a function of lifting and lowering a work according to the related art, the cost is high because the apparatus includes two devices of the L-shaped arm and the traverser. Lifting work,
Since the traverse and the reversal are performed as separate operations, the operation takes time. As described above, in the prior art, for example, a long work having a rectangular cross section such as a bridge and a building steel frame is assembled, welded, inverted for storage, and the like.
For lifting and transporting, there was a problem in terms of danger of disaster during work and work efficiency.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is directed to a moving carriage provided with a traveling means for transporting a long work having a rectangular cross section. A first arm and a second arm rotatably provided on a rotation shaft at a position, and a first arm provided substantially horizontally on a base of a movable cart connected to the first arm by a link mechanism.
A hydraulic cylinder, and a second hydraulic cylinder provided substantially horizontally at a base of a movable trolley connected to the second arm by a link mechanism, wherein the first arm is provided by the first hydraulic cylinder and the second arm. The first hydraulic cylinder is capable of being independently rotated about a horizontal position and a vertical position about the rotation axis by the second hydraulic cylinder.
The first arm and the second arm form an L-shape by the first hydraulic cylinder and the second hydraulic cylinder, and the first arm or the second arm at a substantially horizontal position below a long work having a rectangular cross section mounted on a base. The second arm is moved, and is conveyed at a position lifted from the base by the L-shaped rotation formed by the first arm and the second arm, and the center height of the rotating shaft is ho, and the first arm is The radius of rotation of the L-shaped corner formed by the first arm and the second arm is r, the height of the horizontal position of the first arm and the second arm is h, and the height of the base on which the work is placed is h + δ, where When δ ≧ 0, (ho + r)
> (H + δ), the work is lifted up at the same time as the work is lifted only by the L-shaped rotation formed by the first arm and the second arm. A movable trolley that has a mechanism for lifting and conveys a long work having a rectangular cross section in the lateral direction. Further, the movable carriage for transporting the long work having the rectangular cross section in the lateral direction is characterized in that the first arm and the second arm are provided with sensors for detecting the work.

[0005]

According to the present invention, the first and second arms are independently rotatable about a rotation axis between a substantially horizontal position and a substantially vertical position. When placing a work,
One of the arms is made substantially horizontal and moved below the work on the base to place the work, and the other arm is turned to a substantially vertical position to form an L-shape with the first arm and the second arm. The long work can be turned over. Further, the L-shape formed by the first arm and the second arm is changed to the L-shape by the first hydraulic cylinder and the second hydraulic cylinder.
The corner portion of the mold is rotated to a position substantially on a vertical line of the rotation axis so that the work can be lifted.

[0006] Regarding the reversal and lifting of the work, FIG.
This will be described with reference to FIGS. In the figure,
(1) is a first arm, (2) is a second arm, (3) is a rotating shaft, and (10) is a work. First, FIGS.
Will be described. This is a case where the work is placed on a pillow (base) having a height (h + δ), and the horizontal position of the first arm (1) is related to the height (h). Note that (ho + r)> (h
+ Δ).

As shown in FIG. 11, the work (10) is moved under a pillow having a height (h + δ) with the first arm (1) substantially horizontal. The second arm (2) is pivoted to a substantially vertical position by a hydraulic cylinder, and the first arm (1) and the second arm (2) form an L-shape. Next, as shown in FIG. 12, the first arm (1) and the second arm (2), which are L-shaped, are moved to α by hydraulic cylinders operating the respective arms.
With the rotation of the degree, the lower part (Q) of the work (10) comes into contact with the work (10), and the weight of the work (10) shifts from the pillow to the L-shape.

Then, as shown in FIG. 13, the first arm (1) and the second arm (2), which are further L-shaped, are rotated by hydraulic cylinders for operating the respective L-shaped corners (1). The work (10) is lifted to the position (ho + r) by positioning P) on a substantially vertical line of the rotation axis (3). Since (ho + r)> (h + δ) is set here, the work (1) placed on the pillow with the height (h + δ) at the position of (ho + r) lifted is set.
0) can be transported by a trolley away from the pillow.

Another example will be described with reference to FIGS. 14, 15 and FIG. This is because when the height at which the work is placed is equal to the height of the horizontal position of the first arm (1), that is, the height (h) at which the work is placed, and the horizontal position of the first arm (1) is This is the case of the height (h). FIG.
As shown in (1), the tip of the first arm (1) is moved to the lower portion of the work (10) with the tip of the first arm (1) slightly lower than horizontal (h-α). The second arm (2) is pivoted to a substantially vertical position by a hydraulic cylinder, and the first arm (1) and the second arm (2) form an L-shape. Next, as shown in FIG. 15, the first arm (1) and the second arm (2), which are L-shaped, are rotated by hydraulic cylinders for operating the respective arms to contact the lower surface of the work (10), The weight of the work (10) is transferred from the pillow to the L-shape.

Next, as shown in FIG. 13 described above, the first arm (1) and the second arm (2), which are further L-shaped, are rotated by hydraulic cylinders for operating the respective arms.
The work (10) is (ho + r) because the L-shaped corner (P) is located substantially on the vertical line of the rotation axis (3).
Lifted to the position. This lifted (ho + r)
Work (1) placed on a pillow of height (h)
0) can be transported by a trolley away from the pillow.

As described above, the L-shaped corner portion (P) rotating about the center O of the rotation axis (3) rotates on the locus of the circumference of the radius r, and the corner portion in FIG. 13 (and FIG. 16). (P)
Is (ho + r) at a position substantially on the vertical line of the rotation axis (3).
It can be lifted to the position. As a result, the work (10) placed on the L-shape formed by the first arm (1) and the second arm (2) is rotated only by the work (1).
The lift-up of 0) is performed simultaneously with the rotation. That is, lift-up and lift-down of the work (10) is a mechanism that is necessarily performed during rotation of the L-shaped arm constituted by the arms (1) and (2). In addition, the work can be inverted and lifted without providing a means for lifting and lowering the work.

Further, when the L-shaped corner portion (P) is located substantially on the vertical line of the rotation axis (3), that is, the position where the work (10) is inclined by approximately 45 ° from the horizontal position, the work is maximized. The work (10) is positioned almost vertically on the rotation axis (3), and the load is stable on the movable trolley. Can be.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a movable carriage according to the present invention, the movable carriage conveys a long work having a rectangular cross section in a lateral direction, and the traveling means includes, for example, wheels traveling on an laid track (rail). Alternatively, it is preferable that wheels are provided to travel tracklessly, and the traveling power be provided to the bogie. In addition, the mobile trolley is driven by a motor with a speed reducer that drives wheels. Further, the first arm and the second arm provided on the rotating shaft are each a pair of two in order to stably mount the long work, and the first arm and the second arm are respectively connected by a link mechanism. It is preferable to provide the first and second hydraulic cylinders.

Further, the first and second hydraulic cylinders are provided substantially horizontally at the base of the cart, and this does not make the overall height of the movable cart so high that the long work can be inverted.
It is important to carry out lifting and transporting operations without danger in a stable manner. Further, the first arm and the second arm provided on the rotating shaft are respectively rotated by hydraulic cylinders connected by a link mechanism, and the rotation is substantially horizontal position. And a substantially vertical position. Also, the rotating shaft is provided on the bogie, but it is provided at an intermediate position between the front and rear wheels of the bogie, and when the work is inclined approximately 45 °, the center of gravity is substantially on the vertical line of the rotating shaft, A stable load state is set on the bogie by being positioned in the middle.

Further, a sensor for detecting a work is provided on the first arm and / or the second arm to detect a state of the work, control a hydraulic cylinder, and correspond to an arm rotation speed and a weight of the work. It is. Specifically, the arm comes into contact with the workpiece, detects the contact, and transmits it to the drive unit of the bogie to automatically stop the bogie. In addition, it is also possible to detect the state of the work and control the transmission to the hydraulic cylinder to control the rotation speed of the arm and the like. The operation of the traveling drive unit and the hydraulic cylinder (hydraulic circuit) of the movable trolley is performed by manual button operation, and a series of operations can be automatically performed by attaching a sequencer.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view showing an embodiment of the present invention, and FIG.
FIG. FIGS. 3, 4 and 5 are views for explaining the operation of the embodiment of the present invention in a state where the work is placed. 6 and 7 are views for explaining the operation of the hydraulic cylinder according to the embodiment of the present invention. FIGS. 8, 9 and 10 are views for explaining the link mechanism according to the embodiment of the present invention.

First, FIGS. 1 and 2 will be described. 1 and 2, (1) is a first arm, (2) is a second arm, (3) is a rotating shaft, (4) is a bogie, (5) is a wheel, and (12) is a first arm. The hydraulic cylinder, (22) is a second hydraulic cylinder. The rotating shaft (3) is provided at an intermediate position between wheels (5) before and after the bogie (4). The first arm (1) and the second arm (2) are rotatably provided on a rotating shaft (3) of a truck (4). 1st arm (1)
Is composed of two pieces for stably mounting a long work. If necessary, the two first arms (1) (1) may be connected by a rod. Similarly, the second arm (2) may be composed of two, and the two second arms (2) and (2) may be connected by a rod. The first arm (1) and the second arm (2) are preferably provided with a sensor (not shown) for detecting a work.

The first arm (1) is connected to a first hydraulic cylinder (12) by a link mechanism, and the second arm (2) is connected to a second hydraulic cylinder (22). The first hydraulic cylinder (12) is provided substantially horizontally at the base of the truck (4). The second hydraulic cylinder (22) is also the first hydraulic cylinder.
It is provided substantially horizontally at the base of the trolley (4) alongside the hydraulic cylinder (12). First hydraulic cylinder (12)
Is rotatably provided on a carriage (4) around a shaft (15). The piston (1) of the first hydraulic cylinder (12)
4) is connected to the link (11) by a connecting portion (13). Similarly, one end of the second hydraulic cylinder (22) is provided on the truck (4) so as to be swingable about a shaft (25), and the piston (24) of the second hydraulic cylinder (22) is connected to the connecting portion (2).
3) is connected to the link (21).

Next, referring to FIGS. 3, 4 and 5, the state in which the work is placed and the operation thereof will be described. FIG. 3 is a view showing a state where a work is placed, and FIG. 4 is a view seen from the right side of FIG. As shown in FIGS. 3 and 4, the truck (4) is provided with wheels (5), and the wheels (5) are transmitted from the drive unit (6) to the transmission means (7).
And the carriage (4) can run on the rail (9). The truck (4) has a first hydraulic cylinder (12) and a second hydraulic cylinder (22) provided substantially horizontally at its base.

One end of the first hydraulic cylinder (12) is swingably provided on a carriage (4) by a shaft (15), and its piston is connected to a link (11) by a connecting portion (13). The arm (1) is rotated about a rotation axis (3) between a substantially horizontal position and a substantially vertical position. Also, the second
One end of the hydraulic cylinder (22) is connected to a trolley (4) by a shaft (2).
The piston is provided so as to be swingable at 5), and the piston is connected to the connecting portion (2).
The third arm is connected to the link (21) to rotate the second arm (2) between the substantially horizontal position and the substantially vertical position about the rotation axis (3). Then, the work (10) is placed on the first arm (1), and the second arm (2) is turned to a substantially vertical position to make the work (10) into an L-shape.
To support. When the work (10) is placed on the horizontal first arm (1), a support member (not shown) is provided between the lower part of the first arm (1) and the carriage (4) to support the load. ). Second arm (2)
The same is true for

Next, as shown in FIG. 5, the work (10) mounted on the L-shape of the first arm (1) and the second arm (2) is moved approximately 45 degrees around the rotation axis (3). The work (10) can be lifted by rotating to an inclined position. At this time, the operation of the first arm (1) and the second arm (2) constituting the L-shape is performed by pushing out the piston of the first hydraulic cylinder (12) to move the first arm (1) from a substantially horizontal position. The second arm (2) is pivoted to a position inclined at approximately 45 ° and the piston of the second hydraulic cylinder (22) is pulled.
Is rotated from a substantially vertical position to a position inclined at approximately 45 ° to rotate the work (10) to a position inclined at approximately 45 ° to lift the work (10).

Next, the first arm and the second arm in FIGS.
The operation of the arm will be described. As shown in FIG. 6, the first arm (1) rotates about the rotation axis (3) from a substantially horizontal position indicated by a chain line to a substantially vertical position indicated by a solid line. The first arm (1) is connected to a piston (14) of a first hydraulic cylinder (12), which is swingably provided on a bogie (4) by a shaft (15). Are linked. At a substantially horizontal position indicated by a dashed line, the operation of the first hydraulic cylinder (12) is started, the hydraulic cylinder (12) is further operated, the piston (14) is pushed out, and the first hydraulic cylinder (1) is pushed out as indicated by a solid line.
2) The first arm (1) is slightly inclined with the link (11).
Is rotated to a substantially vertical position indicated by a solid line.

As shown in FIG. 7, the second arm also pivots about the rotation axis (3) from a substantially horizontal position indicated by a chain line to a substantially vertical position indicated by a solid line. The second arm (2) is provided with a piston (2) of a second hydraulic cylinder (22) that is swingably provided on a cart (4) about an axis (25).
4), the second hydraulic cylinder (22) starts operating at a substantially horizontal position indicated by a dashed line, and is connected to the connecting portion (23) and the link (21).
Is further actuated, the piston (24) is pushed out, and the second hydraulic cylinder (22) is inclined as shown by the solid line to rotate the second arm (2) by the link (21) to the substantially vertical position shown by the solid line. It is to let.

The link mechanism will be described with reference to FIGS. 8, 9, and 10. FIG. 8 shows the first arm (1), the rotating shaft (3), the connecting portion (13), and the link (11). The connecting portion (13) and the link (1) are attached to the piston of the first hydraulic cylinder.
These are connected in 1). 9 and 10 illustrate the operation of the link mechanism. The overall height of the movable trolley is important for safely performing the operation of reversing, lifting, and transporting a long work. For this purpose, the first and second hydraulic cylinders are provided substantially horizontally at the base of the trolley, but the overall height of the movable trolley also needs to consider the structure of the link mechanism.

In the link mechanism shown in FIG. 9, one end of a first hydraulic cylinder (12) is provided on a truck so as to be swingable about a shaft (15), and the first arm (1) rotates around a rotation shaft (3). The piston (14) of the first hydraulic cylinder (12) is connected to the link portion (11) by a connecting portion (13), and the force of the first hydraulic cylinder (12) in the direction of the arrow (P ₁ ). To rotate the first arm (1) in the direction of the arrow (M). Although the link mechanism is shown integrally with the first arm (1) for the purpose of explanation, the present invention is not limited to this, and the link section (11) and the first arm (1) can be formed separately.

When the first hydraulic cylinder (12) is pushed in the direction of the arrow with the force of (P ₁ ), the connecting portion (13) becomes an arc at the center of the rotating shaft (3) with the radius of (R ₁ ) of the link portion (11). It moves on the upper trajectory, and the force of the hydraulic cylinder (12) (P ₁ )
And the reversal moment (M) are represented by the following equation. M = P ₁ · R ₁ · sin θ ₁ (θ ₁ is an angle formed by an initial horizontal line.)

[0027] In the link mechanism shown in FIG. 10, in which different the angle of the link mechanism and the initial horizontal line in FIG. 9, the angle of the initial horizontal line is the case of the theta _2. FIG.
0 is the case where θ ₂ = 90 degrees and M = P _2.
The R _2. That is, if θ ₂ = 90 degrees as shown in FIG. 10, the hydraulic cylinder force can be rationally exerted. Either the link mechanism shown in FIG. 9 or the link mechanism shown in FIG. 10 is used in consideration of the overall height of the movable carriage and the size of the hydraulic cylinder.

The operation of reversing, lifting, and transporting a long work of the movable carriage of the embodiment will be described. FIG. 16 shows a case where a long work is turned upside down by approximately 45 degrees and transported. The hatching of the work (10) is displayed for easy understanding of the inverted state. First, as shown in FIG. 16A, a first arm (1) and a second arm (2) are placed below a work (10) on a pillow (30).
The L-shaped horizontal first arm (1) formed in step (1) is moved as shown by the arrow. The work (10) is automatically stopped at the position of the work (10) by a touch sensor provided on the vertical second arm (2). Next, the L-shaped first arm (1) and second arm (2) are each rotated by a hydraulic cylinder, and the work (10) is lifted from the pillow (30).

Further, as shown in FIG. 16 (b), the work (10) is rotated by approximately 45 degrees to position the L-shaped corner on a substantially vertical line of the rotating shaft (3).
Lifting. Here, the cart (4) moves as indicated by the arrow and conveys the work (10). Work transferred (10)
As shown in FIG. 16 (c), the cart (4) on which the work (10) is placed is stopped at the position of another pillow (31), and the first arm (1) forming an L-shape To the horizontal position,
The work (10) is placed on the pillow (31), and in this way, the long work (10) is transported in parallel in the initial state.

FIG. 17 shows the entire movement of the mobile trolley (4) in FIG. 16 described above. FIG. 17 (a) is a plan view and FIG. 17 (b) is a side view. FIG. 17 (a),
The work (1) on the pillow (30) in the zone A shown in FIG.
0) is lifted, and the carriage (4) on which the work (10) is placed is moved in the direction of the arrow, transported to the zone B, and given a pillow (3).
The work (10) is put on the pillow (31) by stopping at 1) and rotating the arm.

FIG. 18 shows a case where a long work is turned upside down by approximately 45 degrees, transported, and turned upside down by 90 degrees. First, as shown in FIG. 18A, a first arm (1) and a second arm (2) are placed below a work (10) on a pillow (30).
The L-shaped horizontal first arm (1) formed in step (1) is moved as shown by the arrow. The work (10) is automatically stopped at the position of the work (10) by a touch sensor provided on the vertical second arm (2). Next, the L-shaped first arm (1) and second arm (2) are each rotated by a hydraulic cylinder, and the work (10) is lifted from the pillow (30).

Further, as shown in FIG. 18 (b), the work (10) is rotated by approximately 45 degrees to position the L-shaped corner on a substantially vertical line of the rotating shaft (3).
Lifting. Here, the cart (4) moves as indicated by the arrow and conveys the work (10). Work transferred (10)
As shown in FIG. 18 (c), the carriage (4) on which the work (10) is placed is stopped at the position of another pillow (31), and the second arm (2) forming an L-shape To the horizontal position,
The work (10) is placed on the pillow (31). In this way, the long work (10) is transported and turned 90 degrees.

FIGS. 19 (a) to (e) and FIGS. 20 (f) to
(H) is a case where the long work is inverted by 180 degrees. First, as shown in FIG. 19A, an L-shaped horizontal first arm formed of a first arm (1) and a second arm (2) under a work (10) on a pillow (30). Move (1) as shown by the arrow. The work (10) is automatically stopped at the position of the work (10) by a touch sensor provided on the vertical second arm (2). Next, the L-shaped first arm (1) and second arm (2) are each rotated by a hydraulic cylinder, and the work (10) is lifted from the pillow (30).

Further, as shown in FIG. 19 (b), the work (10) is rotated by approximately 45 degrees to position the L-shaped corner on a substantially vertical line of the rotation axis (3).
Lifting. After lifting the work (10), the carriage (4) is moved as indicated by the arrow on the rail while the load of the work (10) is stored in the two L-shaped arms, and the work is moved to the right of the pillow (30). Convey (10). The transferred work (10) rotates the second arm (2) forming the L-shape to a horizontal position as shown in FIG. 19C, and moves the work (10) by 90 degrees. Invert and temporarily place on the pillow (30).

Next, as shown in FIG.
The arm (1) is rotated to a horizontal position, and the first arm (1) and the second arm (2) are made horizontal. Next, FIG.
As shown in the figure, the horizontal first arm (1) and second arm (2) are passed under the work (10) from the right side to the left side of the pillow (30) as shown by arrows. Next, as shown in FIG. 20 (f), the second arm (2) at the horizontal position is rotated to the vertical position, and the first arm (1) and the second arm (2) form an L-shape. The first arm (1) and the second arm (2), which are L-shaped, are rotated, and the work (1) is rotated.
0) is lifted from the pillow (30).

The work (10) is further rotated and rotated approximately 45 degrees to lift the work (10) as shown in FIG. Here, the carriage (4) is moved as shown by the arrow, and the work (10) is transported to the right of the pillow (30). The transferred work (10) rotates the second arm (2) forming the L-shape to a horizontal position as shown in FIG. 20 (h), and firstly moves on the pillow (30). Is turned 180 degrees from the above state.

The long work shown in FIGS.
In the case of turning over by 80 degrees, a specific embodiment is, for example, a case in which a long work is a box girder of a highway having a large square or rectangular cross section of about 3 m on a side, and FIG.
Assembling the box girder and welding the upper part of the box girder, and FIG.
It is inverted at the stage shown in FIG. In FIG. 20 (h), which is inverted by 180 degrees, the other side of the box girder is welded and appropriately conveyed to a stocking place (payback place).

[0038]

As described above, according to the present invention,
Since the first arm and the second arm are independently provided so as to be rotatable about a rotation axis between a substantially horizontal position and a substantially vertical position, the work can be lifted without providing a lifting device on the truck. It has the effect of lifting and transporting a long workpiece, performing 90 ° inversion, 180 ° inversion, and various operations, and assembling a long workpiece having a rectangular cross section, such as a bridge or a building steel frame. In addition, the time required for reversing, lifting, and transporting for a welding process, storage, and the like can be reduced, and the operation can be performed efficiently and safely. In addition, compared to the conventional method in which a lifting device is separately provided, the occupied area is relatively small, and the manufacturing cost is significantly reduced, so that it is economical.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a plan view showing an embodiment of the present invention.

FIG. 3 is a view for explaining the operation of the embodiment of the present invention in a state where a workpiece is placed.

FIG. 4 is a diagram for explaining the operation of the embodiment of the present invention in a state where a workpiece is placed.

FIG. 5 is a view for explaining the operation of the embodiment of the present invention in a state where a workpiece is placed.

FIG. 6 is a diagram illustrating the operation of the hydraulic cylinder according to the embodiment of the present invention.

FIG. 7 is a diagram for explaining the operation of the hydraulic cylinder according to the embodiment of the present invention.

FIG. 8 is a diagram illustrating a link mechanism according to an embodiment of the present invention.

FIG. 9 is a diagram illustrating a link mechanism according to an embodiment of the present invention.

FIG. 10 is a diagram illustrating a link mechanism according to an embodiment of the present invention.

FIG. 11 is a view for explaining reversal and lifting of a work according to the present invention.

FIG. 12 is a view for explaining reversal and lifting of a work according to the present invention;

FIG. 13 is a view for explaining reversal and lifting of a work according to the present invention.

FIG. 14 is a view for explaining reversal and lifting of a work according to the present invention.

FIG. 15 is a view for explaining reversal and lifting of a work according to the present invention;

FIG. 16 is a diagram for explaining the operation of the mobile trolley according to the embodiment of the present invention.

FIG. 17 is a diagram for explaining the operation of the mobile trolley according to the embodiment of the present invention.

FIG. 18 is a view for explaining the operation of the mobile trolley according to the embodiment of the present invention.

FIG. 19 is a diagram for explaining the operation of the mobile trolley according to the embodiment of the present invention.

FIG. 20 is a diagram for explaining the operation of the mobile trolley according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st arm 2 2nd arm 3 rotation axis 4 trolley 5 wheel 10 work 12 1st hydraulic cylinder 22 2nd hydraulic cylinder

 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 63-73208 (JP, U) JP-A 63-100420 (JP, U) JP-B 5-24047 (JP, B2) JP-B 58- 37867 (JP, Y2)

Claims (2)

(57) [Claims] 1. A mobile trolley provided with a traveling means for transporting a long workpiece having a rectangular cross section, a first arm and a second arm rotatably provided on a rotation shaft at an intermediate position between front and rear wheels of the mobile trolley. An arm, a first hydraulic cylinder provided substantially horizontally at a base of a movable cart connected to the first arm by a link mechanism, and an arm provided substantially horizontally at a base of the movable cart connected to the second arm by a link mechanism. A second hydraulic cylinder, wherein the first arm is independently moved by the first hydraulic cylinder and the second arm is moved substantially horizontally and substantially vertically by the second hydraulic cylinder. The first arm and the second arm are connected to the first hydraulic cylinder and the second arm.
An L-shape is formed by a hydraulic cylinder, and the first arm or the second arm in a substantially horizontal position is moved under a long work having a rectangular cross section placed on the base, and is formed by the first arm and the second arm. Transported at a position lifted from the base by the rotation of the L-shape, and the center height of the rotating shaft is ho, and the radius of rotation of the L-shaped corner formed by the first arm and the second arm. Is r, the height of the horizontal position of the first arm and the second arm is h, and the height of the base on which the work is placed is h + δ, where δ ≧ 0, (ho + r)> (h
+ Δ), the work is lifted up simultaneously with the rotation only by the L-shaped rotation formed by the first arm and the second arm, and the work is inverted and lifted. A movable trolley for transporting long workpieces having a rectangular section in the horizontal direction. 2. The movable trolley according to claim 1, wherein a sensor for detecting the work is provided on the first arm and the second arm.